Body defence mechanisms

What is a pathogen?

• A germ that causes disease

• A disease

• A microbe that causes disease

• Something that can make you feel very ill

Which 2 categories do our defence mechanisms fall into?

• Physical and Chemical

• Physical/Chemical and the Immune System

• Non-specific and specific

• Fight or Flight

Which 2 features does your nose have to prevent pathogens from entering the body?

(a)  

What lines your trachea to help prevent pathogens from entering your lungs?

(a)  

Name the acid in your stomach that can destroy pathogens.

(a)  

What is the name given to the substances in your tears that can destroy pathogens?

• lysozymes

• enzymes

• tears

Name the group of cells in your blood that is involved in destroying pathogens.

• Red blood cells

• Platelets

• Plasma

• White blood cells

White blood cells can make antitoxins, engulf and ingest pathogens and make (a)  

Proteins on the surface of cells that help with cell recognition are called..?

(a)  

What shape is an antibody compared to an antigen?

• Complementary

• Mirror image

• The same shape